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The classic Vicsek model [Phys.Rev.Lett. {\bf75},1226(1995)] is studied inthe regime of very low noise intensities, which is shown to be characterized bya cluster (MC) that contains a macroscopic fraction of the system particles. Itis shown that the well-known power-law behavior of the cluster sizedistribution loses its cutoff becoming bimodal at very low noise intensities: Apeak develops for larger sizes to settle the emergence of the MC. The averagecluster number m*, is introduced as a parameter that properly describes thischange, i.e. a line in the noise-speed phase portrait can be identified toseparates both regimes. The average largest cluster parameter also developslarge fluctuations at a non zero critical noise. Finite size scaling analysisis performed to show that a phase transition to a macroscopic cluster is takingplace. Consistency of the results with the literature is also checked andcommented upon.

Emergence of a single cluster in Vicsek's model at very low noise